Ahunui or Nga-taumanga[2] is a small atoll of the eastern Tuamotu Archipelago in French Polynesia.

[3] Ahunui Atoll is roughly circular in shape and measures 6.5 km in diameter.

Ahunui Atoll is permanently uninhabited, but it is visited occasionally by neighboring islanders.

The rarer pipi oysters (Pinctada maculata) are found in its lagoon.

[4] The first recorded European who arrived to Ahunui Atoll was British mariner Frederick William Beechey.